/*
 * Copyright (C) 2012 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hapjs.features.barcode.camera.open;

import android.hardware.Camera;
import android.util.Log;

public final class OpenCameraInterface {

    private static final String TAG = OpenCameraInterface.class.getName();

    private OpenCameraInterface() {
    }

    /**
     * Opens a rear-facing camera with {@link Camera#open(int)}, if one exists, or opens camera 0.
     */
    public static Camera open() {
        int numCameras = Camera.getNumberOfCameras();
        if (numCameras == 0) {
            Log.w(TAG, "No cameras!");
            return null;
        }
        int index = 0;
        while (index < numCameras) {
            Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
            Camera.getCameraInfo(index, cameraInfo);
            if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
                break;
            }
            index++;
        }
        Camera camera;
        if (index < numCameras) {
            Log.i(TAG, "Opening camera #" + index);
            camera = Camera.open(index);
        } else {
            Log.i(TAG, "No camera facing back; returning camera #0");
            camera = Camera.open(0);
        }
        return camera;
    }
}
